Basal cells - type of cells that are found in the lowest part of the outer layer of skin. Basal cells are responsible for producing the squamous cells in the skin.

Basal cell carcinoma - the most common form of skin cancer; characterized by small, shiny, raised bumps on the skin that may bleed.

Biological therapy (Also called biological response modifier (BRM) therapy, or immunotherapy.) - tries to get your own body to fight cancer by using materials made by your own body, or made in a laboratory, to boost, direct, or restore your body's natural defenses against disease.

Biopsy - the procedure of removing tissue for examination under a microscope.

Botulinum toxin type A - an injection of botulinum toxin into specific muscles will immobilize those muscles, preventing them from forming wrinkles and furrows.

Carcinoma - cancer that begins in the skin or in tissues that line or cover internal organs.

Chemical peels - a procedure often used to minimize sun-damaged skin, irregular pigment, and superficial scars. The top layer of skin is removed with a chemical application to the skin. By removing the top layer, the skin regenerates, often improving the skin's appearance.

Chemotherapy - treatment with drugs to destroy cancer cells.

Collagen - a natural protein found in humans that forms connective tissue and provides strength, resilience, and support to the skin, ligaments, tendons, bones, and other parts of the body.

Cryosurgery - freezing the tumor, which kills cancer cells.

Cyst - a deep lesion that is filled with pus or other liquid contents.

Dermabrasion - used to minimize small scars, minor skin surface irregularities, surgical scars, and acne scars. As the name implies, dermabrasion involves removing the top layers of skin with an electrical machine that "abrades" the skin. As the skin heals from the procedure, the surface appears smoother and fresher.

Dermatofibroma - small, red or brown bumps in the skin that are not cancer.

Dermis - the middle layer of skin, which is made up of blood vessels, lymph vessels, hair follicles, sweat glands, collagen bundles, and fibroblasts.

Dermoid cyst - a benign tumor made up of hairs, sweat glands, and sebaceous glands.

Photodynamic therapy - uses a certain type of light and a special chemical to kill cancer cells.

Punch grafts - small skin grafts to replace scarred skin. A hole is punched in the skin to remove the scar, which is then replaced with unscarred skin (often from the back of the earlobe). Punch grafts can help treat deep acne scars.